Figure 3
From: Direct Measurement of Optical Force Induced by Near-Field Plasmonic Cavity Using Dynamic Mode AFM
Calculated (a) z-component of the electric field distribution (side view of a mid-vertical-plane cut) and (b) x-component of the magnetic field distribution across the horizontal plane in the middle of the gap between the gold nano-disk and gold plate.
A plane wave infrared laser light of λ = 1550 nm is incident to the plasmonic cavity from the bottom quartz substrate. The diameter of the nano-disk is d = 380 nm, its height is τ = 16 nm and the cavity separation is set at r = 30 nm. The unit cell is 580 nm. The color bar indicates the field strength normalized by the maximum field strength obtained when a laser light of λ = 635 nm is incident to the non-resonant cavity. (c) Calculated enhancement factor E of the induced optical force acting on the top gold plate relative to its non-resonance value as a function of separation r for the cavity with gold disk size d = 380 nm. The solid line is drawn to guide the eye.
